Uniswap v3 Mainnet LaunchHappened on March 23rd, 2021
"Uniswap v3 is the most powerful version of the protocol yet, with Concentrated Liquidity offering unprecedented capital efficiency for liquidity providers, better execution for traders, and superior infrastructure at the heart of decentralized finance." With the launch of v3, Uniswap announces as public bug bounty that awards $500k for critical bugs.